Galvanized back plate for easy mounting to any structure. The cover plate is constructed of 1/4 in ABS. All manifolds are bolted to the back plate rather than screwed. Each manifold consists of two inlet ports that supply the dual chambers. 3/4 in PEX barb inlets, 1/2 in MPT outlets, 1/2 in FPT swivel x barb valves are included.